<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <h2>{{firstName + ' ' + lastName}}</h2>
      <h2>{{firstName}} {{lastName}}</h2>

      <h2> {{getFullName()}} </h2>

      <!-- 不用加括号，语法糖 -->
      <h2> {{fullName}} </h2>
    </div>

    <script src="../js/vue.js"></script>

    <script>
      const app = new Vue({
        el: "#app",
        data: {
          firstName: "Lebron",
          lastName: "James",
        },
        computed: {
          fullName: function(){
            return this.firstName + ' ' + this.lastName
          }
        },
        methods: {
          getFullName: function(){
            return this.firstName + ' ' + this.lastName
          }
        }
      });
    </script>
  </body>
</html>
